Example F.1-1B W-shape flexural member design in strong-axis bending, continuously braced

The results are generated with SDC Verifier 2024 R2 and calculated with FEMAP 2406. 

Task:

Verify the available flexural strength of the W18×50, ASTM A992 beam selected in Example F.1-1A by applying the requirements of the AISC Specification directly. 

11

Solution:

From AISC Manual Table 2-4, the material properties are as follows:

W18×50

ASTM A992

Fy = 50 ksi

Fu = 65 ksi

From AISC Manual Table 1-1, the geometric properties are as follows

W×50

Zx = 101 in3

The required flexural strength from Example F.1-1A is:

F1 1

Nominal Flexural Strength, Mn

Per the User Note in AISC Specification Section F2, the section is compact. Because the beam is continuously braced and compact, only the yielding limit state applies.

F1 2

From AISC Specification Section F1, the available flexural strength is:

F1 3

Example from AISC Design Examples

Material summary

1..ASTM A992

Properties Summary

1..W18x50

Geometry Property Value
Height 18.00
Width 7.50
h 18.00
a 7.50
b 7.50
c 0.57
d 0.36
t 0.57

FEM Loads and Constraint

1..Dead load (0.45 kip/ft)

bench5

2..Live load (0.75 kip/ft)

bench4

Constraints

1..Pinned

bbbb

Check 1..ANSI / AISC LRFD 360-10

14..Bending

All (IL1, 17 Shapes)

ALL

AL
Comparing results of calculation in SDC Verifier and Example F.1-1B we can see that the values completely match. The available flexural strength is 0.9 * 415.6 * 103 Lbf-ft = 0.9 * 415.6 kip-ft = 374 kip-ft.

Subscribe to Newsletter

Get SDC Verifier insights, news, and updates, straight in your inbox